The exoplanet 55 Cancri e has been observed passing in front of its star for the first time by a ground-based telescope. What do we know about this strange planet?(Photo : NASA/JPL-Caltech/R. Hurt (SSC))

The exoplanet 55 Cancri e has been observed passing in front of its star for the first time by a ground-based telescope. What do we know about this strange planet?